That panel van could be a WC11 half ton 4 x 4 panel, but it is more likely to be a WC42 half ton 4 x 4 radio panel, made specially for the Commonwealth.
Unfortunately the pics don't show enough detail of the distinguishing features - metal roof fill panel, roof mounted vent for the radio heat, and rear window blackout curtains.
I was lucky enough to get a good look round Rick's 1940 RAF aircrew bus before the restoration started, and look forward to seeing it again when he is done...
http://www.oldclassiccar.co.uk/dodge...estoration.htm
Gordon
knows about Dodges